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Synthesis of Pure YB4 Powder via the Reaction of Y2O3 with B4C

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Pure YB4 powder was synthesized via the reaction of Y2O3 with B4C under a vacuum pressure within the range of 20–50 Pa using spark plasma sintering (SPS) route. The effect of temperature and the molar ratio of the starting materials was studied. The role of the YBO3, an intermediate product, in the synthesis of YB4 was investigated. For preparation of high purity YB4, the molar proportion of B4C to Y2O3 should not be higher than the stoichiometric ratio (15/7). YBO3 can be removed through decomposing to Y2O3 and B2O3 or reacting with B4C to form YB4 and B2O3 at a temperature above 1650°C. The little residual impurities, such as Y2O3 and YBO3, can be removed by hydrochloric acid washing. Thus, a high purity YB4 powder has been synthesized. The oxygen content of the obtained YB4 is about 0.007% and the particle size is in the range of 3–10 μm.
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Document Type: Research Article

Publication date: July 1, 2012

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